Collapsible tire-building drum



Oct. 15, 1929. T. A. MILLER I 1,732,194

coLLAPsIBLE TIRE BUILDING DRUM Filed June $0-, 1928 3 Sheets-Sheet 1 IN VEN TOR. THfooQ/s A. /V/A L .6R

zw/@M A TTORNEYS gOct. 15, 1929. 'r. A. MILLER y 1,732,194

COLLPSIBLE TIRE BUILDING DRUM Filed Jun 50, 1928 5 sheets-sheet 2 INVENTOR. 7745000515 A. /7//. L ER A TTORNEYS Oct. 15, 1929. T. A. MILLER 1,732,194

COLLAPSIBLE TIRE BULDING DRUM Filed June so, 1928 s sheets-sheet 3 THEoooE A; MMA/SR Patented Oct. 15, 1929 UNITED STATES PATENT OFFICEv jTHEO:DORE A.

COMPANY, OF AKRON, OHIO, A CORIORATION OF OIIIO COLLAQPSIBLE TIRE-BUILDING DRUM Y Application filed June 30,

The general purpose of the invention is to prov-ide an improved collapsible drum or form especially for building tires in semi-flat form, the beads, when using this type of drum,

^. being .applied to the tire carcasson .reduced shoulders at the sides of the drum.

The particular object of the invention is to provide a sturdy, quick-acting, collapsible drum construction capable of securing a high degree of'contraction to permit easy removal of the finished tire carcass, 'the actuation of the various sections of the drum being positive to effectively withdraw them from the adherent carcass'and preferably being actuatable by a single operating member.

.A further object of the invention is to provide a collapsing mechanism for such drums adapted to separate the adjoining sections P slightly from the key section to permit freeV action thereof when itis removed from the core.

A further object of the invention is to provide an improved form collapsing mechanism adapted to be self-locking in expanded condition..

The foregoing and other objects of the invention are attained in the collapsibledrum construction shown in the accompanying drawings and described below. It is to be understood that the invention is not limited to the particular form thereof shown and described. Y

Of the accompanying drawings,

Figure 1 is an elevation of a collapsible drum embodying the invention, the drum being shown expanded; l

Figure 2 is a similar viewthereof, the drum being shown collapsed Figure 3 is av` section on line `3--3 of Figure 1; and

Figure 4 is a section on line 4-4 of Figure 1. Y

` Referring to the drawings, the numeralflO designates the usual drive shaft on which 192s. sensi 110,289,484.

is secured the chuck 11 having rigidly secured thereto one drum section 12.

Section 12 has hinged onto its opposite ends drum-sections 13 and 14, and an intermediate section 15, opposite section l2, is arranged to complete the drum,.this section constituting a key. section, and having the usual draft as indicated at 16, 16.

Key section 15 is supported on a bar x17 slidable on chuck 11 in a groove defined by gibs 18, 18 secured on the face of the chuck and additionally guided in its movement by shaft 10 which extends through a slot 19 in said bar.

Sections 13 and 14 are connected to said bar 17 for actuation thereby as the key section is actuated, links 20 and 21 being respectively pivoted to said sections at 22 and 2,3 and ivotally connected to the bar 17 respectively at 24 and 25. The pivots 22 and 23 are sub-l stantially at diametrically opposite points and pivots 24 and 25 are relatively above said diameter, i. e. relatively nearer to the key section so that as the key section is moved irlwardly, links 20 and 21 act as a toggle to eX- pand sections 13 and 14 slightly to provide easier withdrawal of the key section.

To actuate the above-described collapsing drum, a toggle mechanism is provided :com-

prising a lever 26 pivoted on the chuck at 27 and a lever 28 pivoted at 29 to Ybar 17, levers 26 and 28 being hinged at 30. An operating handle 31 is secured tolever 26.

The toggle levers 26, 28 lare of such length as to maintain the drum section* 15 in the core section when actuated slightly past a dead center as shown in Figure 1. One of said levers has a stop 32 thereon and the other a pin 33 to prevent collapsing of the toggle levers in their positions past dead center whereby the drum is automatically locked in expanded condition. f 1

In collapsing the drum, the handle 31 1s' swung downwardly and through the toggle leversr draws bar 17 downwardl the latter withdrawing the key section, slig tly spreading the sections 13 and 14 as the ke section passes out of the drum circle and fina ly drawing the sections 13 and 14 inwardly after the key section, bringing the parts to the position shown in Figure 2.

Modifications ofthe invention may be resorted to without departing from the spirit thereof or the scope of the appended claims.

What is claimed is 1. A collapsible tire building drum comprisinga chuck, one drum section secured thereto, second and third drum sections hinged to the opposite ends of the first drum section, a key section intermediate the sec- 15 ond and third sections, a bar supporting the key section and slidable on the chuck, links connecting the hinged section to the bar whereby movement of the key section inwardly of the drum will first slightly expand and then collapse the hinged sections after the key section, and means for collapsing and expanding the drum comprising a toggle connected to the chuck and bar and constructed to lock slightly past a dead center position d-to hold the drum expanded.

V2. A collapsible tire building drum comprising a chuck, one drum section secured thereto, second and third drum sections hinged to the opposite ends of the first druml enfsection, a key section intermediate the second and thirdsections, a bar supporting the key section and slidable on the chuck, links connecting the hinged section to the bar whereby movement of the key section in- ?'wardly of the drum will first slightly expand and then collapse the hinged sections after the key section, and means for collapsing and expanding the drumV comprising a toggle connected to the chuck and bar.

`3. A collapsible tire building drum comprising a chuck, one drum section secured thereto, second and third drum sections hinged tothe opposite ends of the first drum section, a key section intermediate the second and third sections, a bar supporting the key section and slidable on the chuck, links connecting the hinged section to the bar whereby movement of the key section inwardly of the Cil drun'rwill collapse the hinged sections after A the key section, and means for collapsing and expanding the drum comprising avtoggle connected to the chuck and bar and constructed-to lock slightly past a dead center position to hold the drum expanded.

QA collapsible tire building drum comprising a chuck, one drum section secured thereto, second andl third drum sections hinged to the opposite ends of the first drum section, a ke'y section intermediate the second and third sections, a bar supportingl the key section and slidable on the chuck, links connecting the hinged section to the bar whereby movement of the key section inwardly of the drum will collapse the hinged sections after the key section, and means for collapsing and expanding the drum comprising a toggle connected to the chuck and bar.

5. A collapsible tire building drum comprising a chuck, one drum section secured thereto, second and third drum sections hinged to the opposite ends of the first drum section, a key section intermediate the second and third sections, a bar supporting the key section and slidable on the chuck, links connecting the hinged section to the bar whereby movement of the key section inwardly of the drum will rst slightly expand and then collapse the hinged sections after the key section, and means for collapsing and expanding the drum, said means being operatively associated with said bar and vadapted to lock'automatically to hold the drum expanded.

65A collapsible tire building drum comprising a chuck, one drum section secured thereto, second and third drum sections hinged to the opposite ends of the first drum section, a key section intermediate the second andthird sections, a bar supporting the key section and slidable onthe chuck, links connecting the hinged section to the bar whereby movement of the key section inwardly of the drum will collapse the hinged sections after the key section, and means for collapsing vand expanding-the drum, said means being operativelyassociated with said bar and adapted to lock automatically to hold the drum expanded.y v

7 A collapsible tire building prising a chuck,- one drum section secured thereto, second and third drum sections hinged to the opposite ends ofthe first drumV section, a; key section intermediate the second and third sections, a bar supporting the key section and slidable on the chuck, links connecting the hinged section to the bar whereby movement of the key section inwardly of the drum will first slightly expand and then collapse thev hinged` sections after the key section, and means for collapsing and expanding the drum, said means being operatively associated with said bar. f

8; A collapsible tire building drum comprising archuck, oneV drum section secured thereto, second and third drum sections hinged to the opposite ends ofthe first drum section, a key section intermediate the sec--A ond and third sections, a bar supporting the key section and slidable on the chuck, links connecting the hinged section to the' barY whereby movement of the key sectioninwardly of the drum will collapse the hinged means being operatively associated with said bar.. l e v 9. A collapsible drum comprising a fixed;

section, a key section opposite the fixed section and movable toward and from the same,

intermediate sections hinged on the vxed secdrum comtion, and means actuated by movement of the key section for actuating the hinged sections, said means being operable to slightly expand the hinged sections as the key section is Withdrawn from the drum circle.

10. A collapsible drum comprisin a fixed section, a key section opposite the Xed section and movable toward and from the same, intermediate sections hinged on the fixed section, and means actuated by movement of the key section for actuating the hinged sections.

THEODORE A. MILLER. A 

